doc/html/man/curs_clear.3x.html

   1 <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
   2 <!--
   3   ****************************************************************************
   4   * Copyright (c) 1998,2005 Free Software Foundation, Inc.                   *
   5   *                                                                          *
   6   * Permission is hereby granted, free of charge, to any person obtaining a  *
   7   * copy of this software and associated documentation files (the            *
   8   * "Software"), to deal in the Software without restriction, including      *
   9   * without limitation the rights to use, copy, modify, merge, publish,      *
  10   * distribute, distribute with modifications, sublicense, and/or sell       *
  11   * copies of the Software, and to permit persons to whom the Software is    *
  12   * furnished to do so, subject to the following conditions:                 *
  13   *                                                                          *
  14   * The above copyright notice and this permission notice shall be included  *
  15   * in all copies or substantial portions of the Software.                   *
  16   *                                                                          *
  17   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
  18   * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
  19   * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
  20   * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
  21   * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
  22   * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
  23   * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
  24   *                                                                          *
  25   * Except as contained in this notice, the name(s) of the above copyright   *
  26   * holders shall not be used in advertising or otherwise to promote the     *
  27   * sale, use or other dealings in this Software without prior written       *
  28   * authorization.                                                           *
  29   ****************************************************************************
  30   * @Id: curs_clear.3x,v 1.10 2005/10/01 19:34:43 tom Exp @
  31 -->
  32 <HTML>
  33 <HEAD>
  34 <TITLE>curs_clear 3x</TITLE>
  35 <link rev=made href="mailto:bug-ncurses@gnu.org">
  36 <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
  37 </HEAD>
  38 <BODY>
  39 <H1>curs_clear 3x</H1>
  40 <HR>
  41 <PRE>
  42 <!-- Manpage converted by man2html 3.0.1 -->
  43 <STRONG><A HREF="curs_clear.3x.html">curs_clear(3x)</A></STRONG>                                           <STRONG><A HREF="curs_clear.3x.html">curs_clear(3x)</A></STRONG>
  44
  45
  46
  47
  48 </PRE>
  49 <H2>NAME</H2><PRE>
  50        <STRONG>erase</STRONG>, <STRONG>werase</STRONG>, <STRONG>clear</STRONG>, <STRONG>wclear</STRONG>, <STRONG>clrtobot</STRONG>, <STRONG>wclrtobot</STRONG>,
  51        <STRONG>clrtoeol</STRONG>, <STRONG>wclrtoeol</STRONG> - clear all or part of a <STRONG>curses</STRONG> window
  52
  53
  54 </PRE>
  55 <H2>SYNOPSIS</H2><PRE>
  56        <STRONG>#</STRONG> <STRONG>include</STRONG> <STRONG>&lt;curses.h&gt;</STRONG>
  57
  58        <STRONG>int</STRONG> <STRONG>erase(void);</STRONG>
  59        <STRONG>int</STRONG> <STRONG>werase(WINDOW</STRONG> <STRONG>*win);</STRONG>
  60        <STRONG>int</STRONG> <STRONG>clear(void);</STRONG>
  61        <STRONG>int</STRONG> <STRONG>wclear(WINDOW</STRONG> <STRONG>*win);</STRONG>
  62        <STRONG>int</STRONG> <STRONG>clrtobot(void);</STRONG>
  63        <STRONG>int</STRONG> <STRONG>wclrtobot(WINDOW</STRONG> <STRONG>*win);</STRONG>
  64        <STRONG>int</STRONG> <STRONG>clrtoeol(void);</STRONG>
  65        <STRONG>int</STRONG> <STRONG>wclrtoeol(WINDOW</STRONG> <STRONG>*win);</STRONG>
  66
  67
  68 </PRE>
  69 <H2>DESCRIPTION</H2><PRE>
  70        The  <STRONG>erase</STRONG>  and <STRONG>werase</STRONG> routines copy blanks to every posi-
  71        tion in the window, clearing the screen.
  72
  73        The <STRONG>clear</STRONG> and <STRONG>wclear</STRONG> routines are like <STRONG>erase</STRONG>  and  <STRONG>werase</STRONG>,
  74        but  they also call <STRONG>clearok</STRONG>, so that the screen is cleared
  75        completely on the next call to <STRONG>wrefresh</STRONG>  for  that  window
  76        and repainted from scratch.
  77
  78        The  <STRONG>clrtobot</STRONG> and <STRONG>wclrtobot</STRONG> routines erase from the cursor
  79        to the end of screen.  That is, they erase all lines below
  80        the  cursor  in the window.  Also, the current line to the
  81        right of the cursor, inclusive, is erased.
  82
  83        The <STRONG>clrtoeol</STRONG> and <STRONG>wclrtoeol</STRONG> routines erase the current line
  84        to  the  right of the cursor, inclusive, to the end of the
  85        current line.
  86
  87        Blanks created by erasure have the current background ren-
  88        dition (as set by <STRONG>wbkgdset</STRONG>) merged into them.
  89
  90
  91 </PRE>
  92 <H2>RETURN VALUE</H2><PRE>
  93        All  routines  return the integer <STRONG>OK</STRONG> on success and <STRONG>ERR</STRONG> on
  94        failure.  The SVr4.0 manual says "or a non-negative  inte-
  95        ger if <STRONG>immedok</STRONG> is set", but this appears to be an error.
  96
  97        X/Open  defines  no error conditions.  In this implementa-
  98        tion, functions using a window pointer parameter return an
  99        error if it is null.
 100
 101
 102 </PRE>
 103 <H2>NOTES</H2><PRE>
 104        Note that <STRONG>erase</STRONG>, <STRONG>werase</STRONG>, <STRONG>clear</STRONG>, <STRONG>wclear</STRONG>, <STRONG>clrtobot</STRONG>, and <STRONG>clr-</STRONG>
 105        <STRONG>toeol</STRONG> may be macros.
 106
 107
 108 </PRE>
 109 <H2>PORTABILITY</H2><PRE>
 110        These functions are described in the XSI Curses  standard,
 111        Issue  4.   The standard specifies that they return <STRONG>ERR</STRONG> on
 112        failure, but specifies no error conditions.
 113
 114        Some historic curses implementations had,  as  an  undocu-
 115        mented  feature,  the  ability  to  do  the  equivalent of
 116        <STRONG>clearok(...,</STRONG> <STRONG>1)</STRONG> by saying <STRONG>touchwin(stdscr)</STRONG>  or  <STRONG>clear(std-</STRONG>
 117        <STRONG>scr)</STRONG>.  This will not work under ncurses.
 118
 119        This  implementation, and others such as Solaris, sets the
 120        current position to 0,0 after  erasing  via  <STRONG>werase()</STRONG>  and
 121        <STRONG>wclear()</STRONG>.   That fact is not documented in other implemen-
 122        tations, and may not be true of implementations which were
 123        not derived from SVr4 source.
 124
 125
 126 </PRE>
 127 <H2>SEE ALSO</H2><PRE>
 128        <STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>, <STRONG><A HREF="curs_outopts.3x.html">curs_outopts(3x)</A></STRONG>, <STRONG><A HREF="curs_refresh.3x.html">curs_refresh(3x)</A></STRONG>
 129
 130
 131
 132                                                          <STRONG><A HREF="curs_clear.3x.html">curs_clear(3x)</A></STRONG>
 133 </PRE>
 134 <HR>
 135 <ADDRESS>
 136 Man(1) output converted with
 137 <a href="http://www.oac.uci.edu/indiv/ehood/man2html.html">man2html</a>
 138 </ADDRESS>
 139 </BODY>
 140 </HTML>